She shattered the 30-year-old record by selling 21,477 boxes of cookies, and she sat down with Elisabeth Hasselbeck this morning to reveal how she did it.

Katie, a resident of Oklahoma City, explained that on weekdays she spent about seven hours a day selling cookies, asking every person she saw.

On weekends? No rest and relaxation for Katie, who said 11, 12 and 13-hour days were typical.

"I actually decided last year I wanted to beat the world record and at the beginning of my sale my goal was 18,100. When I got to that goal, I raised it to 20,000. And then when I got to that, I went on to 21,000," she explained, noting that Thin Mints are the top seller.

Katie said she quickly learned that to be successful in sales, you can't take "no" personally.